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This O-ring is made of black Buna-nitrile, is round in cross-section, has a durometer of 70A, and is designed for use in a wide variety of sealing applications.
Buna-nitrile can have high tensile strength, and abrasion, tear, and compression set resistance. It can be used in temperatures between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C), and is compatible for use with petroleum, HFA, HFB and HFC fluids, vegetable oil, alcohol, acids and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight and weathering and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.
This Buna O-ring has a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation.
O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section, and a hole in the center, similar to a doughnut. O-rings are available in various sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.
These Buna-nitrile O-rings meet standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.
SaidWhatWhen
Reviewed in the United States on August 7, 2024
I refill my own cylinders and sometimes lose the o-ring or find one not up to par. These are a great fit.
Customer
Reviewed in Canada on January 8, 2024
work well,
Accurate Reviewer
Reviewed in Canada on July 10, 2023
These are decent quality.
terrie277
Reviewed in the United States on June 19, 2023
Highly recommend this seller
Rob
Reviewed in the United States on February 19, 2023
Was trying to use o-rings from a kit and found that they were actually slightly smaller cross-section than the ones I removed from my hydraulic couplers, and they would not seal. Thinking I got a bad batch, ordered another kit from a different brand and found the same problem. These however are the proper size, at 0.103" cross-section. The ones in the kits were 0.094", which is exactly 3/32" in decimal form. Problem with that is the o-ring has to be a bit bigger than the groove to seal. These ones will get the job done. Very glad to finally find some that are correct. Next time I buy o-rings I'm going to make sure they mention the AS568A standard.
David R
Reviewed in the United States on January 28, 2020
Always good to have O rings on hand and buying in bulk usually pays for itself in 3-5 applications vs brick and morter small quanities
Terra_Karma
Reviewed in the United States on March 22, 2018
I use these for fuel cap seals and they work great.
christian
Reviewed in the United States on October 9, 2017
AAA+++!!!
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